linux-kernel - Re: [PATCH v2] seccomp: Make syscall skipping and nr changes more consistent

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Date:	Thu, 9 Aug 2012 12:35:33 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	James Morris <jmorris@...ei.org>
Cc:	James Morris <james.l.morris@...cle.com>,
	linux-kernel@...r.kernel.org, Will Drewry <wad@...omium.org>,
	x86@...nel.org
Subject: Re: [PATCH v2] seccomp: Make syscall skipping and nr changes more consistent

On Thu, Aug 2, 2012 at 9:36 PM, James Morris <jmorris@...ei.org> wrote:
> On Wed, 1 Aug 2012, Andy Lutomirski wrote:
>
>> This fixes two issues that could cause incompatibility between
>> kernel versions:
>>
>>  - If a tracer uses SECCOMP_RET_TRACE to select a syscall number
>>    higher than the largest known syscall, emulate the unknown
>>    vsyscall by returning -ENOSYS.  (This is unlikely to make a
>>    noticeable difference on x86-64 due to the way the system call
>>    entry works.)
>>
>>  - On x86-64 with vsyscall=emulate, skipped vsyscalls were buggy.
>>
>> This updates the documentation accordingly.
>>
>> Signed-off-by: Andy Lutomirski <luto@...capital.net>
>> Acked-by: Will Drewry <wad@...omium.org>
>
> Please rebase this to
> git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security.git next
>
> or wait until the next -rc, where I'll sync with Linus.
>

The conflict is because Linus has a partial fix for the same problem
that went in very late for 3.5, which isn't in your tree.  My patch
applies cleanly to 3.6.0-rc1 and to the result of merging your tree
with 3.6.0-rc1.

The relevant upstream changes are
5651721edec25bf73cee060150e684044eac42dc and
09d314425f5bc69fcf793c7890d9e6a3cdcb44be.

If it helps, I can stick the patch into git.

--Andy
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